Matt Sandusky lived with Jerry and Dottie Sandusky as a foster child before being adopted by them when he was 18. Shortly after he moved into the Sandusky home, Matt burned down a barn and attempted suicide, and his life's been marked by episodes of unstable behavior ever since. In November, shortly after the initial charges were filed against Jerry Sandusky, Matt's biological mother told ABC News she long suspected that Jerry had abused her son. All the while, Matt, who's now 33, denied it. Until today.

Jerry Sandusky has six adopted children. One of them is Matt. He's a Second Mile kid who…
Read more Read more

Matt Sandusky's lawyer told Sara Ganim of the Patriot-News of Harrisburg (Pa.) that Matt had met with prosecutors this week to say he had been abused and that he was prepared to testify as a witness against Jerry. NBC's Michael Isikoff had reported on this morning's Today Show that Jerry only agreed not to take the stand in his own defense after Matt had met with the judge and lawyers from both sides at the courthouse on Wednesday.

Given that the jury deciding Sandusky's fate is now in deliberations, Matt Sandusky can have no role in the current trial.